fix: failed to delete a running task

[monkeyWie]

related: #845

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 59.63%. Comparing base (c970378) to head (a31d2d9).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/download/downloader.go	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #852      +/-   ##
==========================================
+ Coverage   59.47%   59.63%   +0.15%     
==========================================
  Files          36       36              
  Lines        4506     4506              
==========================================
+ Hits         2680     2687       +7     
+ Misses       1555     1545      -10     
- Partials      271      274       +3     

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